Roberta Williams, American video game designer, co-founded Sierra Entertainment

Roberta Lynn Williams is an American video game designer and writer, who co-founded Sierra On-Line with her husband, game developer Ken Williams. In 1980, her first game, Mystery House, became a modest commercial success; it is credited as the first graphic adventure game. She is also known for creating and maintaining the King's Quest series, as well as designing the full motion video game Phantasmagoria in 1995.

Sierra Entertainment, Inc. was an American video game developer and publisher founded in 1979 by Ken and Roberta Williams. The company is known for pioneering the graphic adventure game genre, including the first such game, Mystery House. It is known for its graphical adventure game series King's Quest, Space Quest, Police Quest, Gabriel Knight, Leisure Suit Larry, and Quest for Glory, and as the original publisher of Valve's Half-Life series.